EP0430046A2 - Regelverfahren und -einrichtung zur Kompensation von Geschwindigkeitseffekten in einem Tandemkaltwalzwerk - Google Patents

Regelverfahren und -einrichtung zur Kompensation von Geschwindigkeitseffekten in einem Tandemkaltwalzwerk Download PDF

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Publication number
EP0430046A2
EP0430046A2 EP90122223A EP90122223A EP0430046A2 EP 0430046 A2 EP0430046 A2 EP 0430046A2 EP 90122223 A EP90122223 A EP 90122223A EP 90122223 A EP90122223 A EP 90122223A EP 0430046 A2 EP0430046 A2 EP 0430046A2
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EP
European Patent Office
Prior art keywords
roll
tension
value
workpiece
stand
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90122223A
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English (en)
French (fr)
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EP0430046A3 (en
Inventor
Robert S. Peterson
John A. Larsen
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AEG Westinghouse Industrial Automation Corp
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AEG Westinghouse Industrial Automation Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by AEG Westinghouse Industrial Automation Corp filed Critical AEG Westinghouse Industrial Automation Corp
Publication of EP0430046A2 publication Critical patent/EP0430046A2/de
Publication of EP0430046A3 publication Critical patent/EP0430046A3/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B21B37/52—Tension control; Compression control by drive motor control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/06—Threading
    • B21B2273/08—Threading-in or before threading-in
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/06—Threading
    • B21B2273/10—Threading-out or after threading-out

Definitions

  • the present invention relates generally to a control system and method for compensating for "speed effect" in a stand of a tandem cold mill. More particularly, it relates to maintaining a constant roll force and a constant roll gap to produce a relatively higher percentage of "on gauge" material in that portion of the workpiece traveling through the stand during the acceleration and deceleration phases of the mill.
  • the length of the workpiece is on gauge relative to the gauge of the remaining length of workpiece rolled in the other phases of the mill.
  • the stands of the mill are driven at a relatively low rate of speed, and the tension of the material of the workpiece between adjacent stands is regulated by the speeds of the stands.
  • the stands are driven at relatively high rates of speed, where the material tension regulators are switched from regulating the interstand tension by controlling the speeds of the stands to regulating the interstand workpiece tension by controlling the roll gap of each stand. That is, strip tension is controlled at low speeds by controlling the speeds of the stands and at high speeds by controlling the roll gap.
  • on gauge material is produced by maintaining a relatively constant roll gap where the actual roll gap is regulated by considering the apparent roll gap and the modulus of the mill stand.
  • Several systems including the interstand tension regulators, the entry automatic gauge control, and the delivery automatic gauge control are employed in the present day tandem cold mills for controlling the gauge in the workpiece. Some examples are disclosed in United States Patent Nos. 3,740,983; 3,765,203; 3,768,286; 3,848,443; 4,011,743; 4,016,735; and 4,286,447.
  • the present invention has solved the above-described problems of not compensating for speed or oil film effects occurring during the acceleration or deceleration phase of the mill by providing a simple, corrective roll gap control system and method for maintaining a relatively constant actual roll gap in a stand during the acceleration or deceleration phase of the mill.
  • the present invention provides in each stand of a tandem cold mill a roll force memory unit and an oil film roll force controller which operate together to maintain a relatively constant actual roll gap in the acceleration and deceleration phase of the mill. All the components of the roll force memory unit are continually operating prior to the mill accelerating and decelerating to obtain, and store an updated "lock on” roll force which is equivalent to the roll force in the stand prior to the mill accelerating or decelerating. This "lock on” roll force is combined with the instantaneous roll force to produce a roll force error signal. This roll force error signal is altered a certain percentage of the desired tension for the workpiece by a proportional integrator type controller.
  • This proportional integrator controller is further compared with a desired tension and/or an actual tension in the workpiece to produce an error tension value used to control the roll gap mechanism of the stand to obtain an on gauge length in the workpiece travelling through the mill during the acceleration and deceleration phases of the mill.
  • the invention provides for controlling either an electromechanical screwdown device, or an hydraulic piston cylinder assembly for roll gap control in either a tandem tin cold mill having smooth rolls in all stands or in a tandem sheet cold mill having smooth rolls in all but the last stand which has sandblasted rolls.
  • the tension is controlled by a roll gap control system.
  • the output signal from a workpiece tension controller may be initially generated by an input from the tensiometer which input is representative of the roll force in the respective stand.
  • This "lock on" roll force as an output from the workpiece tension controller is fed into the roll gap control system and back into an oil lock on roll force reference control and into an oil film roll force reference controller of the invention to provide an updated output from the workpiece tension controller for regulating the roll gap for constant gauge in the workpiece.
  • This error output is converted into a certain allowable percentage of the desired tension.
  • This roll force error output is part of the input to the workpiece tension controller whose additional input is the desired strip tension and selectively may be the actual tension from the tensiometer.
  • the output from the workpiece tension controller when the work piece is between the last two stands and the last stand has sandblasted rough surface rolls is then preferably used as a change in speed for the downstream stand.
  • the workpiece tension controller output controls the roll gap of the stand that the workpiece is entering.
  • a further object is to provide a roll gap control system for a stand of a rolling mill which measures a roll force representation prior to the acceleration and deceleration phases, and stores this information in a memory unit until the acceleration or deceleration phase, at which time the difference between the stored rolled force representation and the instantaneous roll force representation is calculated proportionately to the desired tension, and is used along with the desired tension and/or the actual tension to control roll gap.
  • a further object of the invention is to obtain a "lock on roll force” or a “lock on roll force representation” which is an average of the roll forces or of the roll force representations considered over a certain time interval prior to the acceleration and deceleration phases, and which "lock on roll force" value may be obtained through computer software of a microprocessor in a subsystem for the mill.
  • Figure 1 is a schematic diagram showing in block form a simplified control system of a first embodiment of the invention
  • Figure 2 is a schematic diagram showing in block form a simplified control system of a second embodiment of the invention.
  • Figure 3 is a schematic diagram showing in block form a simplified control system of a third embodiment of the invention.
  • the invention is directed to controlling the gauge of the length of a workpiece such as a sheet or strip traveling through several stands of a tandem cold mill during the acceleration and/or deceleration phases of the mill.
  • a workpiece such as a sheet or strip traveling through several stands of a tandem cold mill during the acceleration and/or deceleration phases of the mill.
  • this disclosure will concern itself generally with the description as applied to a single stand.
  • the stand is represented herein by two work rolls, but it is to be understood that these work rolls may have a backup roll associated with them.
  • the invention is employed to take into account the "speed effect” or "oil film effect” which is a phenomenon occurring in the mill even when the apparent roll gap remains constant. This phenomenon occurs in the acceleration and the deceleration of the mill where the oil from the gears, bearings, etc. is theorized as causing the roll gap to close upon the increase of the speed of the mill and to open upon the decrease of the speed of the mill.
  • the invention is particularly disclosed with reference to but not limited to generally two types of multi-stand tandem cold mills, which are a sheet cold mill and a tin cold mill.
  • the sheet cold mill has sandblasted (rough) work rolls on the last stand which is used for minimal reduction and whose primary purpose is to put a surface finish on the workpiece.
  • the remaining stands of the sheet cold mill have smooth rolls, as do all of the stands of a tin cold mill, which is the second type of mill in which the invention is disclosed.
  • FIG. 1 there is shown diagrammatically two work rolls 10 representing a stand of a typical four high mill, where the backup rolls are not shown for the sake of simplicity.
  • This mill arrangement particularly has reference to those stands in a tin or sheet mill having smooth rolls and an electromechanical screwdown mechanism for roll gap control.
  • the screwdown mechanism for adjusting and controlling the roll gap is shown by components 12, 14, and 16; where 12 represents the screwdown mechanism, 14 represents the motor for driving the screwdown mechanism 12, and 16 represents the speed regulator for motor 14.
  • a tachometer for detecting the speed of work roll assemblies 10 is represented at 18, and component 20 is representative of a speed regulator and motor for driving the work rolls 10.
  • Roll force sensor 22 associated with upper work roll 10 measures the rolling force.
  • a workpiece 24 is traveling in the direction indicated by an arrow at 26 and into the roll bite of work rolls 10. Workpiece 24 travels over a tensiometer 28.
  • Tensiometer 28 is a typical well-known device in the industry which measures strip tension by the force applied to the tension roll 30, and measures the reaction force by strain gage load cells, which force is produced by the tension in workpiece 24.
  • tension by speed it is well-known in the industry to regulate tension in workpiece 24 either by controlling the speed of the work rolls 10, where the interstand tension regulators are set to what is referred to as “tension by speed,” or by controlling the roll gap where the interstand tension regulators are set to what is referred to as “tension by roll gap control.”
  • the “tension by speed” mode is used generally for the slower speeds, such as during threading and tailing out, and the “tension by roll gap control” is used generally for the higher speeds, such as during the full run of the mill.
  • tensiometer 28 In the "tension by speed” mode, tensiometer 28 is used as is indicated by lead line 31 in conjunction with components 18 and 20, and a suitable electrical circuit (not shown) to regulate the speed of work rolls 10 and their respective backup rolls (not shown). In the "tension by roll gap control” mode, tensiometer 28 detects and measures the actual tension in workpiece 24. The output from tensiometer 24 is shown along line 30 which goes to summing device 32.
  • Summing device 32 receives a desired tension reference along line 34 from a digital computer (not shown) of the mill or from the mill operator.
  • the error value from summing unit 32 is the input along line 36 to a screwdown tension controller 38, whose output signal along line 40 is used to regulate the positioning of the screwdown mechanism 12 for adjustment of the roll gap between work rolls 10 through speed regulator 16.
  • This operation of controlling roll gap control through the tensiometer 24 and screw down mechanism 12 for maintaining a constant roll gap for uniform gauge is continually being performed generally in the full run of the workpiece through the mill when the speed of the mill is in its highest range.
  • the interstand tension regulators of the mill are operating in the "tension by speed” mode whereby the interstand tension in the workpiece is generated by the relative speeds of the adjacent stands.
  • a roll force memory circuit 41 which is used to obtain a "lock on" roll force reference has an inner loop 42, and an outer loop 44.
  • Inner loop 42 consists of a delay operator Z ⁇ 1 indicated at 46, and a summing amplifier 48, which is also part of outer loop 44.
  • Outer loop 44 further consists of summing amplifier 50, operational high gain amplifier 52, and a switch 54. Switch 54 is closed during most of the operation of the mill except during the acceleration and the deceleration phases for a continual input of the roll force detected by sensor 22 through loops 42 and 44.
  • the summing amplifier 50 subtracts a roll force feedback signal provided on lead line 58 by the inner loop 42 from a roll force signal generated by sensor 22 on lead line 56.
  • a signal of summing amplifier 50 is an input on lead 60 for high gain amplifier 52.
  • switch 54 When switch 54 is closed, the output signal from amplifier 52 on lead 62 is a component for the total input to summing amplifier 48.
  • the output of summing amplifier 48 along line 64 is the input to the delay operator 46, whose output is added on lead 66 to the input on lead 62 by the summing amplifier 48.
  • the output of summing amplifier 48 is also partial input to a summing amplifier 68 along line 70, and is subtracted from the instantaneous roll force along line 72 by amplifier 68.
  • Loops 42 and 44 function to continually provide an update of a present roll force reference.
  • the roll force reference is an average of the roll forces sampled in over a certain time period and is the value stored in delay operator 46. This averaging of the roll forces over, say, for instance a 200 millisecond time period, can be obtained by recording and storing the roll forces in a micropressor base control system measured at fixed time intervals for the past 200 milliseconds, then dividing the sum of the roll forces sampled during the past 200 millisecond by the number of roll force samples taken during the 200 millisecond time period.
  • switch 54 in loop 44 is automatically opened thereby interrupting further input into inner loop 42.
  • Inner loop 42 continues to operate at its present input, more about which will be discussed herein.
  • summing amplifier 68 Directly below roll force memory unit 41 in Figure 1 is summing amplifier 68 whose input as stated is the instantaneous roll force and the "lock on” roll force reference. During the acceleration and deceleration phases, the "lock on” roll force reference is continually running only through inner loop 42 in that switch 54 is now open. This "lock on” reference is continually being fed into summing amplifier 68.
  • the "lock on” roll force as stated represents the average of the roll forces taken over the last 200 milliseconds prior to the acceleration or deceleration phase of the mill.
  • the output from summing amplifier 68 is a roll force error and is input to an oil film roll force controller 74 by lead line 76 when switch 78 is closed to complete the circuit.
  • Switch 78 is only closed during the acceleration or deceleration phase of the mill, at which time switch 54 is opened.
  • Oil film roll force controller 74 is preferably a well-known PI (proportional-integral) type controller, having linear characteristics and a typically ⁇ 25% limit range. This range limits the magnitude of the output signal from controller 74. In effect, the tension reference output, ⁇ T, of controller 74 can only be changed within this ⁇ 25% range with respect to the desired reference tension provided by the mill operator or by the digital computer. This output for controller 74 provides a gain control action to the tension reference output ⁇ T.
  • PI proportional-integral
  • the tension reference output, ⁇ T of controller 74 represents a change in the tension in the workpiece due to "speed effects.”
  • This input by lead 80 is positive input and is algebraically summed in summing junction 32.
  • the output on lead 36 of summing junction 32 is proportional to the input and operates the screwdown mechanism for roll gap control.
  • the screwdown mechanism 12 may be operated by using the inputs along leads 34 and 80 into summing junction 32 with no input from tensiometer 28.
  • the mill has been running full and the tension regulators have been in the tension by gap mode.
  • the "lock on" roll force prior to the start of the deceleration phase, or as the case may be to the start of the acceleration phase at which time the workpiece tension control regulators are switched from tension by speed to tension by gap is stored in loop 42 and the roll gap, and thus the roll force in the stand is regulated to this value.
  • the input along lead 30 from tensiometer 28 may be a component for the output of summing junction 32 in which case, the input along leads 30, 34, and 80 are algebraically summed in junction 32 for an output at 36.
  • the output from screwdown tension control 38 is interrupted, and the output of the screwdown speed regulator 16 will be zero and, thus, the speed of the screwdown motor 14 will be zero.
  • summing junction 32 generally receives input which is representative of a tension reference from oil film roll force controller 74 and a desired tension reference, and that the screwdown tension controller 38 operates on a differential value output from summing junction 32 to control screwdown mechanism 12 for work rolls 10.
  • the output 36 of summing junction 32 is a tension error. Under dynamic conditions this tension error will be greater than zero, and at steady state conditions, this tension error will be zero.
  • the interstand back tension in workpiece 24 may be changed by the oil film roll force controller 74 which continually receives its input from roll force memory unit 41.
  • This change in back tension is within allowable limits in the range of a ⁇ 25% of the desired tension supplied by the operator to maintain a relatively constant roll gap by using a "locked on" roll force value which was an average of the roll forces in the stand prior to the acceleration or deceleration phase.
  • switch 78 is opened and the output from oil film roll force controller 74 is slowly decayed to zero (through suitable means not shown) with the input to oil film roll force controller 74 being removed and set to zero.
  • switch 54 which connects an input to inner loop 42 is closed, outer loop 44 now proceeds to monitor the roll force so that a new lock on roll force will be established once the mill speed starts to change again, and when the tension of the workpiece 24 is controlled by adjusting the roll gap of work rolls 10.
  • Oil film roll force controller 74 is not energized again until a selected time period after the mill is being accelerated or decelerated.
  • switch 54 In order to store a "lock on" roll force reference which may be used during the threading, full run, and tailing out of the mill, switch 54 is closed and the present instantaneous roll force is continually being fed into loops 42 and 44 of roll force memory circuit 41.
  • Switch 78 is opened and therefore no input signal is sent to oil film roll force controller 74. As already stated, switch 78 is closed during the acceleration and deceleration phases with switch 54 being opened.
  • components 41, 68, and 74 of the invention are set to zero in preparation for the next rolling operation for the mill.
  • the interstand tension regulator controls are being switched back and forth from the "tension by speed” mode for the slower speeds to the "tension by gap control” mode for the higher speeds.
  • a delay device (not shown) is into the control system so that the oil film roll force controller 74 is only activated after a time period of, say, .12 seconds has elapsed after initiation of its operation. This time period is necessary In order to allow the components of the "tension by gap” control system enough time to achieve a steady state condition.
  • the mill operator can also change the roll gap setting. This can be done by deactivating the oil film roll force controller 74 through operation of switch 78, and the roll force reference can either be updated or retained in roll force memory circuit 41.
  • Figure 1 can be applied to any stand of a tin or a sheet mill employing an electromechanical screwdown, and smooth surface workrolls for reduction of the workpiece.
  • Figure 2 illustrates an arrangement for a mill stand represented by work rolls 82 whose roll gap is controlled by an hydraulic piston cylinder assembly such as that indicated at 84.
  • Work rolls 82 may represent a typical four high stand where the backup rolls are not shown for simplicity.
  • This arrangement of Figure 2 finds particular application in a stand where work rolls 82 have smooth surfaces for roll reduction, as is found in all the stands of a tin tandem cold mill, and in at least all but the last stand of a sheet cold mill, more about which will be discussed shortly.
  • loop 100 is interconnected to loops 96 and 98 in a manner to be discussed hereinafter and represents the component for roll gap control due to speed effects in accordance with the teachings of the invention.
  • the position of work rolls 82 is sensed on line 110 by position sensor 112 whose output on lead 114 is representative of the apparent roll gap. This output from sensor 112 is part of the input to a gap position controller 116.
  • the output on lead 118 is an input to a valve mechanism 120 which controls the flow of fluid into a cylinder of hydraulic piston cylinder assembly 84 as indicated on lead 122.
  • the invention represented by lover loop 100 consists of an oil film "lock on" roll force controller 138 which is equivalent to the roll force memory circuit 41 of Figure 1, and an oil film roll force reference controller 140 which is equivalent to summing junction 68 and oil film roll controller 74 of Figure 1.
  • the output on lead 132 from the workpiece tension controller 130 is fed into roll force reference controller 126 along with the output from roll force sensor 92 for controlling the roll gap by innermost loop 94.
  • the output on lead 132 of workpiece tension controller 130 is also fed on lead 142 into both the oil film lock on roll force reference control 138 as indicated on lead 144 and the oil film roll force reference controller 140 as indicated on lead 146.
  • oil film roll force reference control 138 as indicated on lead 148 is fed into the oil film roll force reference controller 140, whose output is then fed into strip tension controller 130 on lead 150 to complete the feedback loop 100 for components 138 and 140.
  • tensiometer 90 may not be functioning to provide an input to strip tension controller 130.
  • the inputs into strip tension controller 130 are the desired tension value on lead 136 and an input on lead 150 from oil film roll force reference controller 140.
  • loop 94 for roll gap control is regulated to a roll gap setting provided by the operator according to well-known operating practice with no input from the tensiometer 90 or the roll force sensor 92.
  • the output signal 124 from the roll force reference controller 126 is set equal to the roll gap setting of the operator.
  • the output 132 of the tension controller 130 is set equal to the roll force in sensor 92. Now during acceleration when the workpiece tension regulator is switched from tension by speed to tension by roll gap where loops 96 and 98 now control the input to loop 94, there will be a bumpless transfer from tension by speed mode to the tension by roll gap mode.
  • this lock on roll force reference will be an average of the output signal of tension controller 130.
  • oil film roll force reference controller 140 When oil film roll force reference controller 140 is energized, its input is then the average roll force reference from control 140, and the output from tension controller 130, whose input, in turn, is eventually the algebraic sum of the inputs of leads 134, 136, and 150.
  • an input from tensiometer 90 is being supplied to tension controller 130 for a representative roll force to be fed to the components 138 and 140 of the invention for use during the acceleration and/or deceleration phases for operation of the invention in the manner described for Figure 1.
  • FIG. 3 there is shown an upstream roll stand represented by work rolls 154 and a downstream stand represented by work rolls 152.
  • a workpiece 156 travels through these two stands in the direction indicated by arrow 158.
  • Tensiometer 160 detects the tension in workpiece 156.
  • These two stands represent the last two stands in a sheet cold mill where the work rolls 154 of the last stand are sandblasted to obtain a surface finishing in workpiece 156.
  • tension in workpiece 156 is always regulated by controlling the speed relationship between these last two stands. That is, the "tension by speed" mode for the interstand tension regulator between these last two stands is retained with the speeds of the motors driving the work rolls of the downstream stands including work rolls 152 being regulated relative to each other.
  • the roll gap of the last stand represented by work rolls 154 preferably is not changed at any time during the three different main stages of the operation of the mill. Changing of the roll gap of the last stand tends to cause operational problems which are well-known in the industry. In accordance with the teachings of the invention, however, the roll gap of work rolls 154 can now be changed particularly during the "tension by gap” mode of the mill when the downstream stands are in this "tension by gap” mode, more about which will be discussed further.
  • the speed relationship between the last two stands for roll gap control of the last stand is still maintained when using the invention.
  • the invention is easily incorporated into an existing mill with a roll gap control system being shown to the right in Figure 3.
  • the roll gap control system shown to the right of Figure 3 is not being operated by the workpiece tension controller roll gap control.
  • the roll gap of work rolls 154 is controlled by loop 162 where hydraulic cylinder 164 positions the lower work roll 154.
  • the positioning of this lower roll 154 is sensed by gap position sensor 168.
  • This positioning of lower work roll 154 represents the apparent roll gap.
  • the output from sensor 168 is on lead 170, and is part of the input to gap position controller 172, whose output on lead 174, in turn, is input to a valve control 176 which regulates the hydraulic flow to hydraulic cylinder 164.
  • the roll force is sensed by roll force sensor 159 located above the upper work roll 154 in Figure 3.
  • the actual tension in workpiece 156 is detected by tensiometer 160, whose output on lead 178 goes into workpiece tension controller 180.
  • the output along lead 188 from strip tension controller 180 as shown along lead 182 goes into both strip tension controller roll gap control 184 as shown by lead 186 and to the motor for driving the work rolls 152 of the downstream stand as shown by lead 187.
  • Tension controller roll gap control 184 provides part of the input to gap position controller 172 for roll gap control of work rolls 154 of the upstream stand.
  • the invention of Figure 3 consists of an oil film lock on reference control 190 which operates similarly to the roll force memory unit 41 of Figure 1, and an oil film roll force controller 192 which operates similarly to the oil film roll force controller 74 and the summing junction 68 of Figure 1.
  • a signal from roll force sensor 159 is directed on lead 194 into component 190 on lead 196 and into component 192 on lead 198.
  • the output on lead 200 from controller 192 is one input to workpiece tension controller 180, which as already stated, also receives input on lead 178 from tensiometer 160.
  • a third input into tension controller 180 is on lead 202 representing a desired tension value supplied by either the mill operator or by the computer.
  • Line 204 branching from line 202 indicates that limits are placed on the magnitude of the output 200 of controller 192 which limits, as discussed, are in the range of a typical ⁇ 25% of the desired tension reference on lead 202.
  • the operation of the invention in the arrangement of Figure 3 is similar to that of Figure 1.
  • the roll force of work rolls 154 is used to obtain both a lock on roll force in control 190 and an instantaneous rolling force as input on lead 198 into oil film roll force controller 192.
  • the tension reference from controller 192 on lead 200 is used along with the input on lead 178 from tensiometer 160, if such input is available, and the input on lead 202 to generate an error tension value. This error tension value is directed as output on leads 186 and 187.
  • the input on lead 187 is representative of a change in the speed for the motors driving work rolls 152. This stand speed reference change then regulates the speed of work rolls 152 at a desired rate to obtain the required tension in workpiece 156.
  • the input on lead 186 is used to regulate the roll gap control system of work rolls 154 by way of loop 162.
  • workpiece tension controller 180 will always have an input from tensiometer 160 and will always control the speeds of the downstream stand of work roll 152 to control the tension in workpiece 156.
  • the oil film roll force controller 192 is energized and an input 200 is added to the tension controller 180 in addition to the desired tension value.
  • the oil film roll force controller 192 is de-energized and its output signal 200 is slowly decayed to zero.
  • the delivery automatic gauge control system for the mill is capable now of adequately controlling the strip thickness to the desired value as it leaves the mill.
  • the workpiece tension controller roll gap control 184 will change the upstream roll gap of work rolls 154 to cause the output signal 182 from the workpiece tension controller 180 to go to zero.
  • the workpiece tension controller roll gap control 184 is only operational when the oil film roll force controller 192 is not in operation.
  • the components 190 and 192 of the invention of Figure 3 are operating with workpiece tension controller 180 changing the speed regulator for work rolls 152.
  • This stand speed reference change causes a reduction in the workpiece 156 in the last stand of work rolls 152 according to well-known rolling mill principles.
  • the workpiece tension controller roll gap control 184 can be operated for controlling the roll gap of the upstream stand of work rolls 154 and/or a speed reference from workpiece tension controller 180 can be supplied to the speed regulator of the downstream stand of work rolls 152 without any input into workpiece tension controller 180 from the oil film roll force controller 192.
  • Figure 3 represents a last stand of a sheet cold mill wherein the rolls are sandblasted for surface finish. It is to be understood that the downstream stands can employ the embodiment of the invention shown in Figure 2 for smooth work rolls if the roll gap control is regulated by an hydraulic piston cylinder control system or the embodiment of Figure 1 if the roll gap control is regulated by an electromechanical screwdown control system.
  • Figure 3 shows an hydraulic roll gap control system, however, it is to be understood that an electromechanical screwdown can also be used, and the invention operated in the same manner as described for Figure 3.
  • the reason the oil film roll force controller ( Figures 1 and 3) and the oil film roll force reference controller 140 ( Figure 2) compensate within a typical ⁇ 25% limit range with regard to the desired tension is to prevent the tension from becoming too high or low. If the tension in the workpiece is too high, the workpiece may break, and if, too low, the workpiece may develop wavy edges resulting in thickness variation across the width of the workpiece.
  • the invention has been disclosed in terms of components and/or devices interacting with existing devices control systems, and mechanisms in a roll stand. However, it is to be appreciated that the invention can be implemented by the electrical circuit of Figure 1 and/or a computer program easily integrated into a microprocessor of the mill control system.
EP19900122223 1989-11-29 1990-11-20 A control system and method for compensation for speed effect in a tandem cold mill Withdrawn EP0430046A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/443,695 US5012660A (en) 1989-11-29 1989-11-29 Control system and method for compensating for speed effect in a tandem cold mill
US443695 1989-11-29

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EP0430046A2 true EP0430046A2 (de) 1991-06-05
EP0430046A3 EP0430046A3 (en) 1992-08-26

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US (1) US5012660A (de)
EP (1) EP0430046A3 (de)
JP (1) JPH03238112A (de)
CN (1) CN1056073A (de)
BR (1) BR9006040A (de)
CA (1) CA2031053A1 (de)

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EP0638374A1 (de) * 1992-04-15 1995-02-15 Aluminum Company Of America Referenzanpassung von Walzwerkbetätigungseinrichtung für Geschwindigkeitänderungen
WO2008043689A1 (de) * 2006-10-12 2008-04-17 Siemens Aktiengesellschaft Verfahren zum regeln eines istzuges auf einen sollzug mittels eines modells der zugregelstrecke adaptierten zugreglers

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CN1056073A (zh) 1991-11-13
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EP0430046A3 (en) 1992-08-26
JPH03238112A (ja) 1991-10-23

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